Electric meter.



H.`N. ALwoon. ELECTRIC METER. y APPLIATIOH FILED AUG. 20. 1908.

Patented Jau 10,l 1911.

3 SHEETSSHEET 1.

Witnesses Ha N. TWD.

.ELECTC NET5?.

x??mrnvam; umm 1.36.11 uw. n v 981,236. Y 'K PatentedJan. 10,1911.

3 SHEETS SHEET 2.

fw t@ w Si y Inval .tLor Har-Vy NAU/voed,

H. N. ATWOOD.

.ELECTRIC METER.

APPLIOTIOE FILED AUG, 20. 1508.

Patented Jan. 10, 1911.

- a SHBETS-SHEBT a.

Inventor'. Harr-y N. Atwood,

W'thesses: 9% w narran Smyrne Parana* orifice.

HARRY N. AIWOOD, OF LYNN. MASSACHUSETTS, .ASSIGNOR TO GENERL vELEGTR-ICCOMPANY, A CORPORATION OF NEVJ YORK.

ETECTRC METER.

sisi ezio.

Specification of Letters Relient.- Patented Jan.- 10, 1911.

Application filed August 20. 190B'. Serial No. 449.413.

To` all 'whom it ifi-.fly concern.'

Be it linown that' I. llARiiir .\Tw oon.

a citizen of the l'nited States. residing! at Lynn', eorinty of Essex.State of Massachusetta. have invente certain new and uscfui fImprovements in lllectric Meters, of which the `following is :ispecification.

Bly invention relatesto meters, and more particolari) to .so-calledmercury meters where an armature revolves in a receptacle containing:rmercury, and has for its object certain. improvements in theconstruction of such meters which will make them cheaper E to constructand more reliable.

I accomplish the object of my invention .by the use of a disk armaturerevolving iii i a flatreceptacle containingT mercury and lieing Subjectto the intiuenee of two-magnets dianiet'ricaliy opposed with respect tothe armature in orner to balance each other's effect upon the armature,and thus, as far as possible, eliminate friction; and also by the usclof an indicating pointer which turns l through nearl;v 360, and thusgives che 1nstrumenta greater range and allows the position 0f thepointer to be read with greater ease than may tie done in the usualforms of indicatingr meters.

more clearly the construction of the meter: Fig. 2 is a side viewiartially in section; and

Fig. 3 is a top view of the meter with the top portion removed. foraclearer understz'inding;r of my invention.

I have shown a back 1, to which is at tachefl a cover 2 b any suitablemeans, the frontl of the cover icing eomposel ot a .sheet of glass. orsome transparent, material 3. Attached to the back of the meter I have ishown a mcniber, which supports the workz ing parts of the meter andattached to the lower portion of the member 4 I have shown a member 5.which is substantially disk-like` in shape. Beneath the member 5, andattached thereto, I have shown member G of substantially the saine shapeas member 5, but not in close contact with member 5, except at' theedges; so that there is left bei tween thesitwo members a space 7, whichi may be filled with mercury or any maniciconducting' liquid. and inwhich space sui'- rounded by the liquid fillingi the .space re-v volvesarmature Spivhieh made `in the i `shape of a disk. and ot' any suitableconductz iu r material. The armature connected to :i shaft 9, whichbears at its lower extremity against a bearing 1() let into member t' ini any well known manner, and at. its upper i extremity bears againstbearing 11` which Vis supported by arm 12 ot' member 4.

I have shown two C-sliapeil magnets 12, which are made up of punehingslof magnetic material; the magnets being supported hy arms 14 of member 4in such a way that 2 thcy'are diainetrieally opposed with retorence tothc armature of the meter. (hie pole of these magnets. 15,' extend;through the i top of cover 5 of the meter. so as to he in close relationto the armature, -ind the other pole 15I fits cloScly against'.nir-inher (l, which l I prefer to make of sonic magnetic material, lsuch as castiron, while member 5 may be made of some nonanagncticmaterial,A such as aluminum. Surrounding magnets 13, I have shown coils1G, which are potential coils.,

the circuit which I desire to measure, coils 16 being so wound thatpoles 15 of each magg not. will be of opposite polarity. 17 are.Londuetors which are brought into contact with the mercury of the meteron diainetrical line. on which the magnets 1S are placed, and which arein close relationship with the armature S. and extend through suitable`bushings 1T to insulate them from members 5 and 6. Coi'iductors 1T areconnected by conductors 18 ti. studs 19, which extend through asuitable'l insulating: member 2O through the back of the meter. and mayhe used tor fastening the meter to any suitable. support; and are alsoused for conveying,r the current from the circuit to be measured.Attached to the. armature shaft is a small weight 21, which partiallycounler-balanees the buoyant eltect of the mercury upon the armature.and may be. slipped down. so as to close aperture made. in the top ot'cover 5, through which aperture the shatt passes, and thus preventsA anyleakage or' mercury when the motor is heineT shipped. Attached to the.shaft is also a weight 23, which fur- 5 ther serves to balance thearmature. t 24 is a gear-wheel, which is connected to l .l and areconnected across the conductors` oi'A Further improvements are pointedout;

2 1 Y rsi.;

which Imiiilul' QT. i

in lining my nich-r. l' uumlr-ct. one cfm- (lmgiox' of flic circuit,irhivh l desire to measi Lw, su ihm the curi-vm rciil luw thriiiij willhe simpl): pmporlirinal (n ihr: current ilwuiiig iii ilw cirrfiiil.

Whilv l have lL-scribvd n Ciirlniirform it'. which my iri\' -iit; ii muybe Carrlcd Oul, l in im: limit in vsuli fo ilus form, but Scrl;

in 'hf' nmwiirlml claims i0 cowl :Ill furnis' :nzfi :m :z'ligwr iii-mrriziiniirl lim upper Pd mi zi hxift rniafzihlv in (he merr' puriionnlio the prmhu-,l m the, cnrrmii'. and the voiizig. ".Yhii'i the.connections :ire nimh* f l have lscribecl, :mil the currfm. is llmrf ingin the. circuit, lh'v. uriimiurcwill tend to revolve in a. cert-iinrirvrlimi: und will bv oppasml by the zirtimi of he Spring, .iill'il acondition of equilibrium is ohininwi whe-ri: hc torque of the nilri'vrarmature is equal i0 the restraining loriinfof the spring, at

wicl'i point ihn arnmiiire xviii remain in a wiislzizl posiiion :and thesunouril. of energy' consumed muy he read by he l silikon of needle 27in from'. of dini It will be obvious to the.

skilieil in the :ii-t haiff While l have desrrilwd :i meierf where thetorquen the armature is pro- (hired hf; the interaction of the currentfiiowing ilu-nigh the :mimi-ure and n mag-Q miic lield which varies withVthe poteniiril :and is zmsed by puiential windings upon g :m iron corein the Well understood maxim-r, 'tizii I muy rvphic the poenlinlnizigiirs by gwrmnivnt inagiiifi. am! Shim nhi'iiii: nu

s ""U .Ahavlr a hnfiingf into thi nwri-iiry inir :rmireying riirrmir inthe :u'umlurin im magiwiS energized by windings whim@ currf-:t varieswith ne pociilinl of the circuit lo he mcnturerl, in uperative relationin the armuliirv. und disposed mi opposite sidos 'if die simil. :i backfr lha nwlir, :i iiwmlsP- :illzirhwl therein Supporting the Urhhif pars)1` the melfir, imi-ing iwo arm1 [or supporing the magnets :md :i third,firm :n'rr ing an upper bearing for the shaft, :i p-'xiner gfared lo"hifsimil for indicating the @Kruit o? its movement, a spiral spring.fateiief io the shaft for restraining its movement., and :1

Weighi mi the shaft c0unir-halancing the HARRY N. ATVOD,

Witneses: i mmv-.vn IJ: R03 ELIAS, Joux A. MCMAXFS.

